A2197 / Ipad 7th Gen / 2019 - No Power / Low Current Draw

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  • willis6732
    Member
    • Feb 2023
    • 41
    • Canada
    #1

    A2197 / Ipad 7th Gen / 2019 - No Power / Low Current Draw

    Hello,

    Ive been working on this ipad for a little while now. CPU reballing is a common issue needed on this model.

    I wanted to try and verify there is not a PMIC Problem before reballing the CPU.

    Powering 4.2V at the battery gives a 0-1ma Draw
    Pressing the power button it jumps to 18+ma and settle at 15ma

    Ive attached my Readings for many of the power rails.
    THis is how the columns are layed out:
    Ohms/ Diode / Voltage After power button Press / Injecting Voltage Reading



    In the second attachment there are some odd reading on vss Sense lines. They only come out the bottom of the CPU to a test point under the board. They read short on ohm meter, dioded and voltage injection..



    What ive Figured out now it that if i warm up the CPU/CPU Area, the current draw goes from 15ma up to 50ma and if i freeze the area i get like 11ma

    This makes me think more to do a CPU Reball, but i am still new with Ipads


    Can anyone chime in on this?

    Thanks
    Kevin

    Schematics found here
    https://www.badcaps.net/forum/showth...ighlight=a2197
    Attached Files
    Tags: None
    • willis6732
      Member
      • Feb 2023
      • 41
      • Canada
      #2
      Re: A2197 / Ipad 7th Gen / 2019 - No Power / Low Current Draw

      Here is my Attahment Upright :$
      Attached Files

        Comment

        • willis6732
          Member
          • Feb 2023
          • 41
          • Canada
          #3
          Re: A2197 / Ipad 7th Gen / 2019 - No Power / Low Current Draw

          I just found out there is a program called "Wuxijin" Seems way more resourcefull than ZXW and seems to way more diode readings. I might buy it today and see if there is more info on this tablet.
          "WUXINJI VS ZXW Schematics Full Review 15 big difference"
          https://youtu.be/vnA2LlEtjNo?si=Ws8nkTtx6RHsfQGH

          All of my Diode Reading in ZXW check out. Except ZXW is missing a few things like the charge port flex.

          Ive attached the Diode Readings from ZXW. The only diode readings i get wrong are the two that have readings over 1V. I think i am doing something wrong here or my meter is weird, I know sometimes you need to swap the polarity of the probes for certain readings.

          Perhaps Repair.wiki or Logi.wiki might have more info on this

          If i cant figure out more, i will probably change the PMIC before the CPU just incase...
          Attached Files

            Comment

            • willis6732
              Member
              • Feb 2023
              • 41
              • Canada
              #4
              Re: A2197 / Ipad 7th Gen / 2019 - No Power / Low Current Draw

              I've purchased Wuxijin now. here are the diode readings for the Charge port flex
              Attached Files

                Comment

                • willis6732
                  Member
                  • Feb 2023
                  • 41
                  • Canada
                  #5
                  Re: A2197 / Ipad 7th Gen / 2019 - No Power / Low Current Draw

                  Awww, I realized the ZXW board is different then the one in the component placement pdf for the ipad 7

                  PDF's HEre post #4
                  https://www.badcaps.net/forum/showth...ighlight=a2197

                  So i redid all my readings from the first post.. Now I only get 1.8always and main, no other voltages... No luck yet...
                  Attached Files

                    Comment

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